When you enter a casino, you may be required to provide identification, and your information may be stored in their databases. Additionally, casinos use surveillance cameras and other security measures to monitor guests and track their activities on the gaming floor.
Yes, casinos typically keep records of how much you win and lose, especially for larger sums of money. This is done for regulatory and tax purposes, as well as for the casino's own internal record-keeping. Winnings over a certain threshold are often reported to the relevant tax authorities.